Wavelength controller and system for a tunable laser

Abstract

The invention concerns a wavelength controller for a tunable laser. The wavelength controller is configured to receive an input signal and in response thereto generate a control signal for tuning the wavelength of the laser. The wavelength controller is configured to receive at least part of the output of the laser as an input signal. The wavelength controller includes an interferometer-based circuit configured to generate phase-shifted intensity values based on the input signal. The wavelength controller includes a vector-based signal synthesizer configured to generate a complex vector-based signal based on the phase-shifted intensity values and to compute at least one vector-representing quantity based on the complex vector-based signal. The vector-representing quantity or quantities is/are substantially linearly correlated with the wavelength. The wavelength controller includes a control signal generator configured to generate the control signal at least partly based on said at least one vector-representing quantity.

Dependencies are inferred from the claim text.